All-solid-state battery having coating layer including layered carbon material and manufacturing method thereof

Abstract

An all-solid-state battery having a coating layer includes a layered carbon material and a manufacturing method thereof. The all-solid-state battery has improved life characteristics depending on repetition of a charge and discharge cycle due to case in diffusion of lithium ions into the coating layer during charging.

What is claimed is: 
     
         1 . An all-solid-state battery comprising:
 an anode current collector;   a coating layer located on the anode current collector and comprising a layered carbon material;   a solid electrolyte layer located on the coating layer;   a cathode active material layer located on the solid electrolyte layer and comprising a cathode active material configured to enable intercalation and deintercalation of lithium ions; and   a cathode current collector located on the cathode active material layer,   wherein the layered carbon material comprises at least one pore.   
     
     
         2 . The all-solid-state battery of  claim 1 , wherein the layered carbon material comprises at least one selected from the group consisting of graphene, graphene oxide, reduced graphene oxide, carbon nanotubes, and combinations thereof. 
     
     
         3 . The all-solid-state battery of  claim 1 , wherein the lithium ions are stored in a form of lithium metal in the at least one pore of the coating layer in a state that the all-solid-state battery is charged. 
     
     
         4 . The all-solid-state battery of  claim 1 , wherein an average diameter D50 of the at least one pore is 30.08 nm to 33.13 nm. 
     
     
         5 . The all-solid-state battery of  claim 1 , wherein a total pore volume of the coating layer is 0.114 cm 3 g −1  to 0.141 cm 3 g −1 . 
     
     
         6 . The all-solid-state battery of  claim 1 , wherein a Brunauer-Emmett-Teller (BET) surface area of the coating layer is 15.03 m 2 g −1  to 17.15 m 2 g −1 . 
     
     
         7 . The all-solid-state battery of  claim 1 , wherein a difference between a thickness of the coating layer in a charged state of the all-solid-state battery and a thickness of the coating layer in a discharged state of the all-solid-state battery is equal to or more than 5 μm. 
     
     
         8 . The all-solid-state battery of  claim 1 , wherein, in a charged state of the all-solid-state battery, the coating layer does not comprise sulfur (S), but comprises at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof. 
     
     
         9 . The all-solid-state battery of  claim 8 ,
 wherein an upper portion of the coating layer adjacent to the solid electrolyte layer comprises lithium (Li), and at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof, and   wherein a lower portion of the coating layer adjacent to the anode current collector comprises carbon (C), lithium (Li), and at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof;   
     
     
         10 . A method of manufacturing an all-solid-state battery, the method comprising:
 preparing a structure configured so that an anode current collector, a coating layer, a solid electrolyte layer, a cathode active material layer and a cathode current collector are sequentially stacked; and   applying a process pressure of greater than 50 MPa but less than 200 MPa to the structure,   wherein the coating layer comprises a layered carbon material comprising at least one pore.   
     
     
         11 . The method of  claim 10 , wherein the process pressure of 85 MPa to 150 MPa is applied to the structure. 
     
     
         12 . The method of  claim 10 , wherein the layered carbon material comprises at least one selected from the group consisting of graphene, graphene oxide, reduced graphene oxide, carbon nanotubes, and combinations thereof. 
     
     
         13 . The method of  claim 10 , wherein lithium ions are stored in a form of lithium metal in the at least one pore of the coating layer in a state that the all-solid-state battery is charged. 
     
     
         14 . The method of  claim 10 , wherein an average diameter D50 of the at least one pore is 30.08 nm to 33.13 nm. 
     
     
         15 . The method of  claim 10 , wherein a total pore volume of the coating layer is 0.114 cm 3 g −1  to 0.141 cm 3 g −1 . 
     
     
         16 . The method of  claim 10 , wherein a BET surface area of the coating layer is 15.03 m 2 g −1  to 17.15 m 2 g −1 . 
     
     
         17 . The method of  claim 10 , wherein a difference between a thickness of the coating layer in a charged state of the all-solid-state battery and a thickness of the coating layer in a discharged state of the all-solid-state battery is equal to or more than 5 μm. 
     
     
         18 . The method of  claim 10 , wherein, in a charged state of the all-solid-state battery, the coating layer does not comprise sulfur (S), but comprises at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof. 
     
     
         19 . The method of  claim 18 ,
 wherein an upper portion of the coating layer adjacent to the solid electrolyte layer comprises lithium (Li), and at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof; and   wherein a lower portion of the coating layer adjacent to the anode current collector comprises carbon (C), lithium (Li), and at least one selected from the group consisting of bromine (Br), chlorine (Cl), iodine (I), and combinations thereof;